The owl pellet can't be used to study fossil records because they can't show the fossils of the animals from very long time ago.
I can't read the paper, so all I can say is read Darwin's Survival of the Fittest and you will understand evolution.
It's empty or fairly large, making the sounds from your hands bounce of the walls and therefore having it echo
You may be talking about change from rapid-acting insulin to intermediate-acting insulin. Rapid acting insulin, as it implies, has onset of 10 to 30 minutes and peaks in 3 hours. Meanwhile, the intermediate-acting insulin takes 1 hour and 30 minutes to 4 hours to take effect, and it peaks in 4 to 12 hours. If changing from rapid-acting to intermediate-acting, there is a big space where there might be no insulin in the body to control blood sugar levels. As a nurse, you should carefully monitor blood glucose levels every 30 minutes and watch out for symptoms of hypeglycemia.
